﻿using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.OracleClient;
using System.Configuration;

namespace XMK.Tadong.StructuredData_IntoDb.Data
{
	/// <summary>
    /// 数据访问基础类(基于Oracle) Copyright (C) Maticsoft
	/// 可以用户可以修改满足自己项目的需要。
	/// </summary>
	public abstract class DbHelperOra
	{
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.		
        public static string connectionString = ConfigurationManager.AppSettings["ConnectionString"];     
		public DbHelperOra()
		{			
		}

        #region 公用方法
        
        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }
        public static bool Exists(string strSql)
        {
            object obj = GetSingle(strSql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        public static bool Exists(string strSql, params OracleParameter[] cmdParms)
        {
            object obj = GetSingle(strSql, cmdParms);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

       
        #endregion



        /// <summary>
        /// 分页查询
        /// 注：需要在传入的SQL中引入 ROWNUM ,并取别名为 RN
        /// </summary>
        /// <param name="pageinfo"></param>
        /// <param name="SQLString"></param>
        /// <param name="cmdParms"></param>
        /// <returns></returns>
        public static DataTable ExecutePageQuery(string SQLString,
            int pageSize, int pageIndex, out int recordCount, params OracleParameter[] cmdParms)
        {
            string executeSql = SQLString;
            string countSql = string.Empty;

            recordCount = 0;

            executeSql = string.Format(@"SELECT * FROM (SELECT a.*, ROWNUM rn FROM (" + SQLString + " )a) aa WHERE aa.rn > {0}  AND aa.RN <= {1}",
            pageSize * (pageIndex - 1), pageIndex * pageSize);
            countSql = @"select count(*) from (" + SQLString + ")A";


            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand();
                PrepareCommand(cmd, connection, null, executeSql, cmdParms);
                using (OracleDataAdapter da = new OracleDataAdapter(cmd))
                {
                    DataTable retTable = new DataTable();
                    try
                    {
                        da.Fill(retTable);
                        cmd.Parameters.Clear();
                        if (!string.IsNullOrEmpty(countSql))
                        {
                            PrepareCommand(cmd, connection, null, countSql, cmdParms);
                            recordCount = int.Parse(cmd.ExecuteScalar().ToString());
                            cmd.Parameters.Clear();
                        }
                    }
                    catch (System.Data.OracleClient.OracleException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return retTable;
                }
            }
        }        



		
		#region  执行简单SQL语句

		/// <summary>
		/// 执行SQL语句，返回影响的记录数
		/// </summary>
		/// <param name="SQLString">SQL语句</param>
		/// <returns>影响的记录数</returns>
		public static int ExecuteSql(string SQLString)
		{
			using (OracleConnection connection = new OracleConnection(connectionString))
			{				
				using (OracleCommand cmd = new OracleCommand(SQLString,connection))
				{
					try
					{		
						connection.Open();
						int rows=cmd.ExecuteNonQuery();
						return rows;
					}
					catch(System.Data.OracleClient.OracleException E)
					{					
						connection.Close();
						throw new Exception(E.Message);
					}
				}				
			}
		}
		
		/// <summary>
		/// 执行多条SQL语句，实现数据库事务。
		/// </summary>
		/// <param name="SQLStringList">多条SQL语句</param>		
		public static void ExecuteSqlTran(ArrayList SQLStringList)
		{
			using (OracleConnection conn = new OracleConnection(connectionString))
			{
				conn.Open();
				OracleCommand cmd = new OracleCommand();
				cmd.Connection=conn;				
				OracleTransaction tx=conn.BeginTransaction();			
				cmd.Transaction=tx;				
				try
				{   		
					for(int n=0;n<SQLStringList.Count;n++)
					{
						string strsql=SQLStringList[n].ToString();
						if (strsql.Trim().Length>1)
						{
							cmd.CommandText=strsql;
							cmd.ExecuteNonQuery();
						}
					}										
					tx.Commit();					
				}
				catch(System.Data.OracleClient.OracleException E)
				{		
					tx.Rollback();
					throw new Exception(E.Message);
				}
			}
		}
		/// <summary>
		/// 执行带一个存储过程参数的的SQL语句。
		/// </summary>
		/// <param name="SQLString">SQL语句</param>
		/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
		/// <returns>影响的记录数</returns>
		public static int ExecuteSql(string SQLString,string content)
		{				
			using (OracleConnection connection = new OracleConnection(connectionString))
			{
				OracleCommand cmd = new OracleCommand(SQLString,connection);
                System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@content", OracleType.NVarChar);
				myParameter.Value = content ;
				cmd.Parameters.Add(myParameter);
				try
				{
					connection.Open();
					int rows=cmd.ExecuteNonQuery();
					return rows;
				}
				catch(System.Data.OracleClient.OracleException E)
				{				
					throw new Exception(E.Message);
				}
				finally
				{
					cmd.Dispose();
					connection.Close();
				}	
			}
		}		
		/// <summary>
		/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
		/// </summary>
		/// <param name="strSQL">SQL语句</param>
		/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
		/// <returns>影响的记录数</returns>
		public static int ExecuteSqlInsertImg(string strSQL,byte[] fs)
		{		
			using (OracleConnection connection = new OracleConnection(connectionString))
			{
				OracleCommand cmd = new OracleCommand(strSQL,connection);
                System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@fs", OracleType.LongRaw);
				myParameter.Value = fs ;
				cmd.Parameters.Add(myParameter);
				try
				{
					connection.Open();
					int rows=cmd.ExecuteNonQuery();
					return rows;
				}
				catch(System.Data.OracleClient.OracleException E)
				{				
					throw new Exception(E.Message);
				}
				finally
				{
					cmd.Dispose();
					connection.Close();
				}				
			}
		}
		
		/// <summary>
		/// 执行一条计算查询结果语句，返回查询结果（object）。
		/// </summary>
		/// <param name="SQLString">计算查询结果语句</param>
		/// <returns>查询结果（object）</returns>
		public static object GetSingle(string SQLString)
		{
			using (OracleConnection connection = new OracleConnection(connectionString))
			{
				using(OracleCommand cmd = new OracleCommand(SQLString,connection))
				{
					try
					{
						connection.Open();
						object obj = cmd.ExecuteScalar();
						if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
						{					
							return null;
						}
						else
						{
							return obj;
						}				
					}
					catch(System.Data.OracleClient.OracleException e)
					{						
						connection.Close();
						throw new Exception(e.Message);
					}	
				}
			}
		}
		/// <summary>
        /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
		/// </summary>
		/// <param name="strSQL">查询语句</param>
		/// <returns>OracleDataReader</returns>
		public static OracleDataReader ExecuteReader(string strSQL)
		{
			OracleConnection connection = new OracleConnection(connectionString);			
			OracleCommand cmd = new OracleCommand(strSQL,connection);				
			try
			{
				connection.Open();
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
				return myReader;
			}
			catch(System.Data.OracleClient.OracleException e)
			{								
				throw new Exception(e.Message);
			}			
			
		}		
		/// <summary>
		/// 执行查询语句，返回DataSet
		/// </summary>
		/// <param name="SQLString">查询语句</param>
		/// <returns>DataSet</returns>
		public static DataSet Query(string SQLString)
		{
			using (OracleConnection connection = new OracleConnection(connectionString))
			{
				DataSet ds = new DataSet();
				try
				{
					connection.Open();
					OracleDataAdapter command = new OracleDataAdapter(SQLString,connection);				
					command.Fill(ds,"ds");
				}
				catch(System.Data.OracleClient.OracleException ex)
				{				
					throw new Exception(ex.Message);
				}			
				return ds;
			}			
		}


		#endregion

		#region 执行带参数的SQL语句

		/// <summary>
		/// 执行SQL语句，返回影响的记录数
		/// </summary>
		/// <param name="SQLString">SQL语句</param>
		/// <returns>影响的记录数</returns>
		public static int ExecuteSql(string SQLString,params OracleParameter[] cmdParms)
		{
			using (OracleConnection connection = new OracleConnection(connectionString))
			{				
				using (OracleCommand cmd = new OracleCommand())
				{
					try
					{		
						PrepareCommand(cmd, connection, null,SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
						cmd.Parameters.Clear();
						return rows;
					}
					catch( Exception  E)
					{				
						throw new Exception(E.Message);
					}
				}				
			}
		}
		
			
		/// <summary>
		/// 执行多条SQL语句，实现数据库事务。
		/// </summary>
		/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OracleParameter[]）</param>
		public static void ExecuteSqlTran(Hashtable SQLStringList)
		{			
			using (OracleConnection conn = new OracleConnection(connectionString))
			{
				conn.Open();
				using (OracleTransaction trans = conn.BeginTransaction()) 
				{
					OracleCommand cmd = new OracleCommand();
					try 
					{
						//循环
						foreach (DictionaryEntry myDE in SQLStringList)
						{	
							string 	cmdText=myDE.Key.ToString();
							OracleParameter[] cmdParms=(OracleParameter[])myDE.Value;
							PrepareCommand(cmd,conn,trans,cmdText, cmdParms);
							int val = cmd.ExecuteNonQuery();
							cmd.Parameters.Clear();

							trans.Commit();
						}					
					}
					catch 
					{
						trans.Rollback();
						throw;
					}
				}				
			}
		}
	
				
		/// <summary>
		/// 执行一条计算查询结果语句，返回查询结果（object）。
		/// </summary>
		/// <param name="SQLString">计算查询结果语句</param>
		/// <returns>查询结果（object）</returns>
		public static object GetSingle(string SQLString,params OracleParameter[] cmdParms)
		{
			using (OracleConnection connection = new OracleConnection(connectionString))
			{
				using (OracleCommand cmd = new OracleCommand())
				{
					try
					{
						PrepareCommand(cmd, connection, null,SQLString, cmdParms);
						object obj = cmd.ExecuteScalar();
						cmd.Parameters.Clear();
						if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
						{					
							return null;
						}
						else
						{
							return obj;
						}				
					}
					catch(System.Data.OracleClient.OracleException e)
					{				
						throw new Exception(e.Message);
					}					
				}
			}
		}
		
		/// <summary>
        /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
		/// </summary>
		/// <param name="strSQL">查询语句</param>
		/// <returns>OracleDataReader</returns>
		public static OracleDataReader ExecuteReader(string SQLString,params OracleParameter[] cmdParms)
		{		
			OracleConnection connection = new OracleConnection(connectionString);
			OracleCommand cmd = new OracleCommand();				
			try
			{
				PrepareCommand(cmd, connection, null,SQLString, cmdParms);
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
				cmd.Parameters.Clear();
				return myReader;
			}
			catch(System.Data.OracleClient.OracleException e)
			{								
				throw new Exception(e.Message);
			}					
			
		}		
		
		/// <summary>
		/// 执行查询语句，返回DataSet
		/// </summary>
		/// <param name="SQLString">查询语句</param>
		/// <returns>DataSet</returns>
		public static DataSet Query(string SQLString,params OracleParameter[] cmdParms)
		{
			using (OracleConnection connection = new OracleConnection(connectionString))
			{
				OracleCommand cmd = new OracleCommand();
				PrepareCommand(cmd, connection, null,SQLString, cmdParms);
				using( OracleDataAdapter da = new OracleDataAdapter(cmd) )
				{
					DataSet ds = new DataSet();	
					try
					{												
						da.Fill(ds,"ds");
						cmd.Parameters.Clear();
					}
					catch(System.Data.OracleClient.OracleException ex)
					{				
						throw new Exception(ex.Message);
					}			
					return ds;
				}				
			}			
		}
        /// <summary>
        /// 执行查询语句，返回DataTable
        /// </summary>
        /// <param name="SQLString"></param>
        /// <returns></returns>
        public static DataTable Query_Table(string SQLString)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    OracleDataAdapter command = new OracleDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }  
                catch (System.Data.OracleClient.OracleException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds.Tables[0];
            }			
        }

		private static void PrepareCommand(OracleCommand cmd,OracleConnection conn,OracleTransaction trans, string cmdText, OracleParameter[] cmdParms) 
		{
			if (conn.State != ConnectionState.Open)
				conn.Open();
			cmd.Connection = conn;
			cmd.CommandText = cmdText;
			if (trans != null)
				cmd.Transaction = trans;
			cmd.CommandType = CommandType.Text;//cmdType;
			if (cmdParms != null) 
			{
				foreach (OracleParameter parm in cmdParms)
					cmd.Parameters.Add(parm);
			}
		}

        ///// <summary>
        ///// 采用事务更新表数据
        ///// </summary>
        ///// <param name="UpdateTable">表数据</param>
        ///// <param name="TableName">表名</param>
        ///// <returns></returns>
        //public static bool TransUpdateTable(DataTable UpdateTable, string TableName)
        //{
        //    using (OracleConnection conn = new OracleConnection(connectionString))
        //    {
        //        //获取要更新的列名
        //        string colNames = "";
        //        for (int i = 0; i < UpdateTable.Columns.Count; i++)
        //        {
        //            if (i == (UpdateTable.Columns.Count - 1))
        //                colNames = colNames + UpdateTable.Columns[i].ColumnName.ToString();
        //            else
        //                colNames = colNames + UpdateTable.Columns[i].ColumnName.ToString() + ",";

        //        }    
                
        //        OracleDataAdapter adapter = new OracleDataAdapter();
        //        OracleCommand myCommand = new OracleCommand("select " + colNames + " from " + TableName + " where 1=0", conn);
        //        adapter.SelectCommand = myCommand;
        //        OracleCommandBuilder builder = new OracleCommandBuilder(adapter);
        //        conn.Open();
        //        using (OracleTransaction trans = conn.BeginTransaction())
        //        {
        //            try
        //            {
        //            myCommand.Transaction = trans;
        //            adapter.UpdateCommand = builder.GetUpdateCommand();
        //            adapter.InsertCommand = builder.GetInsertCommand();
        //            adapter.DeleteCommand = builder.GetDeleteCommand();

                  
        //                //int j = UpdateTable.Rows.Count;
        //                int i = adapter.Update(UpdateTable);

        //                trans.Commit();

        //                conn.Close();
        //                return true;
        //            }
        //            catch (Exception ee)
        //            {
        //                UpdateTable.RejectChanges();
        //                trans.Rollback();
        //                throw ee;
                        
        //            }
        //            finally
        //            {
        //                conn.Close();
        //            }
        //        }
        //    }
        //}
      


        //#endregion
        /// <summary>
        /// 采用事务更新表数据
        /// </summary>
        /// <param name="UpdateTable">表数据</param>
        /// <param name="TableName">表名</param>
        /// <returns></returns>
        public static bool TransUpdateTable(DataTable UpdateTable, string TableName)
        {
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                OracleDataAdapter adapter = new OracleDataAdapter();

                OracleCommand myCommand = new OracleCommand("select * from " + TableName + " where 1=0", conn);
                adapter.SelectCommand = myCommand;
                OracleCommandBuilder builder = new OracleCommandBuilder(adapter);
                conn.Open();
                using (OracleTransaction trans = conn.BeginTransaction())
                {
                    myCommand.Transaction = trans;
                    adapter.UpdateCommand = builder.GetUpdateCommand();
                    adapter.InsertCommand = builder.GetInsertCommand();
                    adapter.DeleteCommand = builder.GetDeleteCommand();

                    try
                    {
                        //int j = UpdateTable.Rows.Count;
                        int i= adapter.Update(UpdateTable);

                        trans.Commit();

                        conn.Close();
                        return true;
                    }
                    catch (Exception ee)
                    {
                        UpdateTable.RejectChanges();
                        trans.Rollback();
                        throw ee;
                    }
                    finally
                    {
                        conn.Close();
                    }
                }
            }
        }

		#endregion	

	

		#region 存储过程操作

		/// <summary>
        /// 执行存储过程 返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
		/// </summary>
		/// <param name="storedProcName">存储过程名</param>
		/// <param name="parameters">存储过程参数</param>
		/// <returns>OracleDataReader</returns>
		public static OracleDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )
		{
			OracleConnection connection = new OracleConnection(connectionString);
			OracleDataReader returnReader;
			connection.Open();
			OracleCommand command = BuildQueryCommand( connection,storedProcName, parameters );
			command.CommandType = CommandType.StoredProcedure;
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);				
			return returnReader;			
		}
		
		
		/// <summary>
		/// 执行存储过程
		/// </summary>
		/// <param name="storedProcName">存储过程名</param>
		/// <param name="parameters">存储过程参数</param>
		/// <param name="tableName">DataSet结果中的表名</param>
		/// <returns>DataSet</returns>
		public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )
		{
			using (OracleConnection connection = new OracleConnection(connectionString))
			{
				DataSet dataSet = new DataSet();
				connection.Open();
				OracleDataAdapter sqlDA = new OracleDataAdapter();
				sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters );
				sqlDA.Fill( dataSet, tableName );
				connection.Close();
				return dataSet;
			}
		}

		
		/// <summary>
		/// 构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值)
		/// </summary>
		/// <param name="connection">数据库连接</param>
		/// <param name="storedProcName">存储过程名</param>
		/// <param name="parameters">存储过程参数</param>
		/// <returns>OracleCommand</returns>
		private static OracleCommand BuildQueryCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)
		{			
			OracleCommand command = new OracleCommand( storedProcName, connection );
			command.CommandType = CommandType.StoredProcedure;
			foreach (OracleParameter parameter in parameters)
			{
				command.Parameters.Add( parameter );
			}
			return command;			
		}
		
		/// <summary>
		/// 执行存储过程，返回影响的行数		
		/// </summary>
		/// <param name="storedProcName">存储过程名</param>
		/// <param name="parameters">存储过程参数</param>
		/// <param name="rowsAffected">影响的行数</param>
		/// <returns></returns>
		public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )
		{
			using (OracleConnection connection = new OracleConnection(connectionString))
			{
				int result;
				connection.Open();
				OracleCommand command = BuildIntCommand(connection,storedProcName, parameters );
				rowsAffected = command.ExecuteNonQuery();
				result = (int)command.Parameters["ReturnValue"].Value;
				//Connection.Close();
				return result;
			}
		}
		
		/// <summary>
		/// 创建 OracleCommand 对象实例(用来返回一个整数值)	
		/// </summary>
		/// <param name="storedProcName">存储过程名</param>
		/// <param name="parameters">存储过程参数</param>
		/// <returns>OracleCommand 对象实例</returns>
		private static OracleCommand BuildIntCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)
		{
			OracleCommand command = BuildQueryCommand(connection,storedProcName, parameters );
			command.Parameters.Add( new OracleParameter ( "ReturnValue",
                OracleType.Int32, 4, ParameterDirection.ReturnValue,
				false,0,0,string.Empty,DataRowVersion.Default,null ));
			return command;
		}
		#endregion	

        /// <summary>
        /// 更新指定表数据
        /// Add By  at  2009/09/15
        /// </summary>
        /// <param name="UpdateTable"></param>
        /// <param name="UpdateTableSql"></param>
        public static bool UpdateTableBySql(DataTable UpdateTable, string UpdateTableSql)
        {
            #region
            //open a connection
            using (OracleConnection conn = new OracleConnection(connectionString))
            {

                OracleDataAdapter adapter = new OracleDataAdapter();
                OracleCommand myCommand = new OracleCommand(UpdateTableSql, conn);
                adapter.SelectCommand = myCommand;
                OracleCommandBuilder builder = new OracleCommandBuilder(adapter);
                conn.Open();
                using (OracleTransaction trans = conn.BeginTransaction())
                {
                    try
                    {
                        myCommand.Transaction = trans;
                        //get the data
                        //OracleDataAdapter adapter = new OracleDataAdapter();
                        //adapter.SelectCommand = new OracleCommand(UpdateTableSql, conn);

                        //OracleCommandBuilder builder = new OracleCommandBuilder(adapter);
                        adapter.UpdateCommand = builder.GetUpdateCommand();
                        adapter.InsertCommand = builder.GetInsertCommand();
                        adapter.DeleteCommand = builder.GetDeleteCommand();
                        //newTable.Rows[0].RowState = DataRowState.Added

                        adapter.UpdateCommand.Transaction = trans;
                        adapter.InsertCommand.Transaction = trans;
                        adapter.DeleteCommand.Transaction = trans;

                        adapter.Update(UpdateTable);

                        trans.Commit();
                        //close the connection
                        conn.Close();
                        return true;
                    }
                    catch (Exception ee)
                    {
                        trans.Rollback();
                        throw ee;
                    }
                    finally
                    {
                        conn.Close();
                    }
                }
            }

            #endregion
        }

	}
}
